| 摘要 |
A method is provided to interpolate a new line between the lines in a sampled television picture, using an edge detection which detects the edge direction. A 3*6 window is used, into which is supplied samples from three known lines, and in which the interpolated pixel is located on the middle line. First two adjacent pixels are selected from the window's upper and lower row, so that the imaginary parallel lines connecting them get nine different directions relative the horizontal plane. Then the sum value of the absolute values of the differences of sample pairs connected by the parallel lines is calculated in each direction so that, when the samples in the window's upper row are designated from the left to the right with symbols r1, r2, r3, r4, r5 and r6, and the samples in the lower row are correspondingly designated with symbols r7, r8, r9, r10, r11 and r12, the sum values in the different directions are calculated as follows: left1 = ¦r2 - r9¦ + ¦r3 - r10¦ left2 = ¦r2 - r10¦ + ¦r3 - r11¦ left3 = ¦r1 - r10¦ + ¦r2 - r11¦ left4 = ¦r1 - r11¦ + ¦r2 - r12¦ vertical = ¦r3 - r9¦ + ¦r4 - r10¦ right1 = ¦r3 - r8¦ + ¦r4 - r9¦ right2 = ¦r4 - r8¦ + ¦r5 - r9¦ right3 = ¦r4 - r7¦ + ¦r5 - r8¦ right4 = ¦r5 - r7¦ + ¦r6 - r8¦. Then it is possible to group the obtained sum values into three groups, to calculate the sum of the groups' values, and to select as the point edge information the direction of that group, in which the sum of the values is the lowest. <IMAGE>
|
